Apparatus for making sectional pipes or conduits.



PATENTED APR. 30, 1907.

J. C. MITCHELL.

APPLICATION FILED JULY 19.1906.

4 SHEETS-SHEET 1.

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APPARATUS FOR MAKING SBCTIONAL PIPES OR GONDUITS.

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J. C. MITCHELL. APPARATUS POR MAKING SEGTIONAL PIPES 0R CONDUITS.

APPLICATION FILED JULY 19.1906.

REITS-SHEET 3.

PATENTED APR J. C. MITCHELL. APPARATUS FOR MAKING SEGTIONAL PIPES 0R CONDUITS.

APPLICATION FILED JULYIQ, 1906.

4 SHEETS-SHEET 4.

UNITED sTATEs PATENT OEEIOE.

JOHN C. MITCHELL, or NEWPORT NEWs, VIRGINIA, A'ssIeNoR To LOCK JOINT PIPE COMPANY, A CORPORATION OE NEW JERSEY.

Specification of Letters Patent.

Patented Aprjn so, 1907.

Application Glad July 19, 1906. Serial No. 326,937-

l citizen ofthe United States, residing at Newprocess.

port News, in the county of Warwick and State of Virginia, have invented certain new and useful Improvements in ApparatusA for Making Sectional Pipes or Conduits, of which the following is a specification, reference being had to the drawings aceompanyingland forming a part of the same. l

The invention which forms lthe subject of this application for Letters Patent is embodie 1n an apparatus devised by me for the manufacture of the sectional pipes or conduits set forthin Letters Patent of the United States llo. 7 9'8 ,486,- granted August 29, 1905, to Philip Aylett. These pi es are composed of laterally and lengitudina ly separable sectional units, with ends and edges adapted to form scarf-'joints and provided with grooves along' their contiguous edges to form keyways when theunits are assembled.' These pipes are usually made of cement or other plastic substance in sectional molds, but as their peculiarconformation requires the employment of molds composed of numerous sections, considerable difiiculty and expense are involved in their manufacture by such It was with a view to minimizing these objections that I devised the method of and means hereinafter described for making these pipe sections, but from' the nature of the improvements and of the articles produced, it will be seen and'understood that thejinvention is applicable generally to the manufacture of other forms of pipe or similar articles from plastic substances. lThe improvements comprise broadly, as af means for shaping and finishin a pipe' sec-ll Ition or the like, a matrix or mo d for receivi ing the-plastic material and imparting thereto the desired exterior conformation, and a die adapted to' be moved l longitudinally across and partly through the matrix for displacing so much of the plastic material as will impart the desired interior conformation to that which remains and is permitted to set or harden.

in, however, necessitates certain details of construction and `design which will be described in full by reference to` the accompanying drawings.

or cutter and certain other The peculiar shape of the` 'special product which is contemplated here- Figure 1 is a longitudinal central section of my improved a paratus in its entiretyI for formin one of t e types of unit of a sectional pipe. ig. 2 is an end elevation and part section of the same-as viewed from the rlght of Fig. 1. Fig. 3 is a similar view from the opposite side of the same figure; Fig. Llisa top plan view of Fig. l, with the movable die arts removed. Fig. 5 isa perspectiveview o the die or c utter with a portion of the top broken away. Fig. 5a is a'detail sectional view of the cutting edge of the diel or cutter, on lineIa-a of Fig. 5, showing the cutting edge formed to compact the material and give a smooth iin-` ish 'toits surface. Fig. 6 is a central transverse section of the means for forming the second typeof pipe unit. Figs. 7 and 8 are pers ective views of the two types of unit whic make up the pipe when properly assembled.

Referring tothe last named figures, 1 and 2 represent, respectively, the male and' female sections or units, which, when assembled, make up a length of i ipe with s igot and bell ends 3 and 4. The lp sections are fashioned, either inthe special ongitudina edges ofthe manner shown or otherwise, to.` form scarf joints, in the contiguous faces of which are Vgrooves 5, which provide key ways when the sections are assembled for the reception of suitable .keys that lock the sections together. Considering first the forml of units shown 1n 8, theapparatus for making it is as follows;

A mold or matrix is built up, preferably of metallic sections having a main body 6, de-

tachable .end plates' 7,` 8, and similarly detachable plates 9 for the lon itudinal edges.

These parts, when assemble form an open mold of the contour desired for the exterior of the pipe section 2.

@and packed in this mold b'y means of suitable tools, it being immaterial how much of the centralspacefisflled, vprovided the walls of the mold are lined with a layer, preferably somewhat thicker than the finished pipe.A

Before the materialhas set or hardened a cutter or die is run into or through the mold which imparts the properconformation and finish to t e inner surface of the plastic material. This device is shown in Fig. 5, and

IOO

45 grooves 5, or'innishing the ,sheare consists `of la rigid cutter 10, generally of steel,

cast or pressed to the form required for the inner surface of the pipe section.

The upper. edges ofthe cutter 10 arcsecured to a rigid plate 11, the longitudinal edges of Which project as shownhand the faces of the detachable edge plates 9, of the mold, are formed' or provided with suitable grooves in Which-the said edges enga e when the cutter is passed through the mod. In practice I have found' it suflicient and desirable to provide a groove 12 in one plate 9, and a ledge or shoulder 13 on the lother to facilitatethe removal of the cutter from the mold at any point in its travel. By 'forcing this cutter;` through vorv across-the'- mold, either by-hand or by (povver, the.gunhecessarymaterial "isp -oif andreioved by the cutter, WhileV that remaining exact form required .for the pipe section, except at the rear or bell end, which is theni'inished by ythe following means: To a crossfbar'orbrace-li at the'rear 'endof the cutterl() ispivoted a-rotaryplate 15 operated by ahandle 16, and constitutinga Wi er or wiping-knife.' When the cutter 10 has een forcedto a5 redetermined point into and through theimo d,`4 this Wiper is partiallyvrotated by thehandle v16,130 remove theexces's of material and .form the inner stepped surface ofthe bell,.a s indicated in Fig. 1. After these operations have been-effected the cutter with its ,appurtenancesf4 'is-2 removed from,y the mold, land the'v fashionedmaterial.

therein allowed-.to set-or harden,"When .fby ther-removal of the vdetachable plates 7,. 8, 9, the finished pipe' 'section maybe removed.

' For' the proper solidilication and iinish of the surfaces formedb the shearing action 4of the cutter 10, andllvvlper .15, itA is desirable, and .in many'cases practically necessary, that the sheared surface of plastic material should be smoothed or compacted by an operation similar to that of a mas'ons trowel. For example, if this is no t done in forming the elements of Ithe scarf joints containing the` bell ends, these arts are liable to fracture. -l provide therefore for such a finish Whereverv it may be 4 as shown in Figf, so that as the cutter enfound' desirable.

I yTo form the grooves 5, strips of suitable' material 17' are secured to the sides ofthe cutter 10, and the forward ends .of these strips are beveled off between two side Walls',

ters themold the 'plastic material Will be displaced and compacted by the stri 's-17,'to `form the grooves. The sameresu t on the restof the inner surface oj thel pipe section is 'secured by beveling or inclinin'g-the shearing edge of the cutter, asI shown at 10a'in the e'tail lsectional view, Fig. 5a, so that, in addition to its cutting or shearing action, it vvill compress and smooth the surface over which lit-passes. In

the pipe section, an

Figs. 1 and 2 the Wiper 15 is seacee f Y;

shown as provided-With inclined or upturned 6 5v I edges 18, 19, for the same purpose.'

As each length of pipe is composed of tvvo sections or units .ofi slightly different confor-v mation to enable .them to. match, the mold and cutter for eachv will be correspondingly 7o formed .For example, Ito produce the male` section, shovvn, in`Fig.-7, these arts Will be made as illustrated in Fig. `6. n this case, in addition'toL the removable plates 9, along the top edges of the mold, it is necessary to 75 i employ removable plates 20, which form the 4stepped Aouter' v'portions of the scarf-joints.

These plates are provided with ribs 2 1, whichl 'form the grooves 5 of Fig. 7 While the cutter 10 .is of 'substantially semi-circularl` form, to* 8o conform-'to the'contour of the inner surface of the sectional unit 1. y ln the above illustration of my invention l have shown the detachable plates 7 8 and 9 'asa-part ofthe mold, and in practice'it iS 85 much more convenient to make them so parplates' lmay be in the formof the latter, and that-in'so far as the plates serve as guide Ways their arrangement or `manner pf vsupport may be indeii- 95 the use' of the .apparatus above described the manufacture of pipe sections of this description may be very greatly facilitated, for, in lieu of having a complete secvroo tional mold f oreach unit, any number of open or partial molds may be used with one cutter. ln the case of'closed or complete molds, also along time is required for the, material to hardem'but by my improvements io 5 this part 'of the process is effected in muchshorter time. 4 Havingl now described my invention,'What l claim is: I

1. An'apparatus for plastic substances comprising, in combination, an open-mold having a contour correspending to that reuired for the exterior of ing to thecontour of the inner surface of the I pipe section and movable across and through the mold to shear off and remove the material therein in excess-of that filling the space be-,

tween-mold and the cutter and having its 12o shearing or cuttingedge formed to compact the material filling thesaid space, as set forth. 1:2. An apparatus'for the manufacture of pipe sections ofthe kind described, from plastic substances, comprising, in combinal1F25 tion, anopen'mold with detachable sections at its ends and edges, and h aving a contour corresponding t^ fb'at required for the ex-l Y v the manufacture of 113:;- lpipe sections of' the kind described ,from

a .die or cutter conform- 'i 1 5 the contour of the inner surface of the pipe sec! terior of the pipe section, and a die or cutter conforming tothe contour of the inner surface of the pipe section and movable across and through the mold to shear ofi` and remove the material therein in excess of that filling the space between the mold and cutter and having its shearing or cuttin edge formed to com act the material filling t e said space, as set orth.

3. An apparatus for the manufacture of pipe sections of the kind described, from plastic substances, comprising, in combination, an open mold having a contour corresponding to that required for the exterior of the pipe section, a die or cutter conforming to tion, except at the bell end, and movable across and through the mold to shear off and remove the material in excess of that illin the space between the cutter and the mol and a rotary wiper carried by the cutter for fashioning the inner surface of the bell end,

- as set forth.

4. The combination with an open mold of lon itudinal guides in fixed relation thereto, an a cutter conformin to the contour of the inner surface of the article to be molded and movable along said guides for shearing off and removin material from the mold in excess of that ling the space between the cutter and mold, the shearing or cutting edge of the cutter being formed'to compact the material filling the said space, as set forth.

5. apparatus for the manufacture of pipe sections of the kind described, from plastic material, comprising, in combination, an. open mold having a contour corresponding with that required for the exterior of the pipe section, and'a cutter or die conforming to the contour of the inner surface of the ipesection and movable across and throug the mold in fixed relation thereto,

the entering edges of the cutter being inclined so as to shear off and remove from the mold less than the total excess of material normally filling the space between the cutter and mold and compact the material remaining in the mold, as set forth. I

6. A11 apparatus for the manufacture of pipe sections of the kind described, from plastic material, comprising, in combina tion, an open mold having a contour corresponding with that required for the exterior of the pipe section, and a cutter or die conforming to the contour of the inner surface of the pipe section and movable across and through the mold in fixed relation thereto, the entering edges of the cutter being of smaller diametrical dimensions than the body of the same, whereby the material not sheared off and removed by the cutter will be compacted in the mold, as set forth.

7 The combination with an open mold, a cutter movable across and through the same, the mold and cutter being so related that the space between them corresponds in shape to that required in the article to be molded, a rotary wiper pivoted to the rear end of the cutter and adapted to form and finish the end portion of said article when the cutter has been forced to a given point in said mold, as set forth.

8. The combination with an open mold having longitudinal detachable plates 9, formed or provided with guides, a cutter 1() having projecting edges or flanges for engaging wit the lguides, and a rotary wiper 15 pivoted tothe rear of the cutter, as and for the purpose set forth.

JOHN C. MITCHELL.

Witnesses: M. LAwsoN DYER, JOHN C. KERR. 

